Figure A.6:Rs-232 Jumper Settings; Figure A.7:Rs-485 Jumper Settings; Rs-232/422/485 Serial Port (Cn15~Cn16); Table A.4:Rs-232/422/485 Serial Port Pin Assigns - Advantech GX2-400 User Manual
Gx2-400 universal network controller with pc card, lan, 2 x usb, 2 x rs-232/485, 2 x rs-232/422/485